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Shimizu had been hospitalized due Buy nike running shoes onlineto "fatigue and stress" in late March, with company chairman Tsunehisa Katsumata taking over operations in his absence.

Three of the six reactors at the plant were damaged when the tsunami that followed the magnitude 9 earthquake March 11 knocked out cooling systems. Hydrogen explosions have blown apart the building surrounding units 1 and 3, the No. 2 reactor is believed to be leaking highly radioactive water and the spent fuel pools of units 1, 3 and 4 have been an ongoing concern for authorities.

Radioactive particles have been spread across much of the surrounding area, and Japan has dumped thousands of tons of radioactive water into the Pacific Ocean to make room for more dangerously contaminated water now flooding the basements of the units' turbine plants.

Sunday, engineers used a flying drone to peer into the damaged reactors in hopes of getting a better look at the units and hopefully the pools of spent fuel inside, company spokesman Junichi Matsumoto said. Images captured by the drone are expected to be released Monday, he said.

And the controversial dumping of less-contaminated water from a waste treatment facility has been completed, Japan's Nuclear and Industrial Safety Agency announced Monday. A total of 9,070 metric tons of water was discharged into the Pacific Ocean in the past week, the agency reported -- less than the 10,000 tons originally expected.

Tokyo Electric plans to use the facility to contain some of the water that has flooded the turbine plants behind units 1 through 3, a critical first step toward restoring normal cooling. The company is now using remote-controlled heavy machinery to clear away debris outside the plant and has begun the process of laying new pipes to start pumping radioactive water into the waste reservoir.

One worker fell ill during the work on Sunday, the company said. The subcontractor, a man in his 30s, was taken to a hospital and diagnosed with exhaustion, Tokyo Electric said. He had been working four-hour shifts since March 23, Tokyo Electric said, and it was unclear whether he had received a day off.

The worker was exposed to 4.82 millisieverts of radation, cheap nike mens acg sandals 2011 but no radioactive substances were found on his body. His cumulative exposure is 16 millisieverts, well below the 250-millisievert limit for workers in the plant. He was with a group of 30 subcontractors working in the area, and was wearing protective gear, the company said.

Meanwhile, two of the world's largest concrete pumps were en route to Japan as part of the effort to help resolve the crisis. Although the pumps were built to pump concrete, they can be modified to pump water at high pressure, with a 230-feet reach and "pinpoint accuracy," said Bill Dwyer, vice president of sales and marketing for manufacturer Putzmeister America.

"It allows workers to work from a greater distance," Dwyer said. One pump is set to arrive in Japan on Monday and the second on Tuesday, he said.

Workers have been pouring hundreds of tons of fresh water a day into the three damaged reactors and the spent fuel pools of units 1-4 to keep them cool until normal circulation systems can be restored. The No. 2 reactor is believed to be leaking highly radioactive water, some of which had been spilling into the Pacific until Wednesday. Runoff from shore is also believed to be carrying some radioactivity to the sea.

The radioactive particles now in the water are dispersing into the ocean. But concentrations of radioactive iodine-131 remained 25 times higher than the Japanese legal standard in water sampled 16 kilometers (10 miles) south of the plant on Saturday.

That's down from 93 times the limit on Wednesday, according to sampling data released Sunday. Levels of longer-lived cesium-137, Reebok ZigTech online which takes 30 years to lose half its radioactivity, remained nearly six times the legal limit but well below levels reported earlier this week.

The week-long discharge was billed as an emergency measure, but it infuriated Japan's fishing industry and drew protests from neighboring South Korea. And the crisis spurred more than 2,000 people to march against nuclear energy in Tokyo on Sunday.

"I was just a couch potato critic, but here we are today with friends for the first time, and I'm sure it's the first time for a lot of people today," said Karima Asuma Stickan, one of the protesters.

Protesters marched from the park, ringed with cherry blossoms, to Tokyo Electric's headquarters and on to the Ministry of the Economy, Trade and Industry, which regulates Japanese nuclear power plants. Makiko Mikami told CNN that no one believes they're getting enough answers from either the utility or the government.

"The problem is, I think I'm not sure they know the whole picture themselves," Mikami said. "If they know, they should share that information with us. And if they don't, they should admit that they're scared as well."